Simulation System with Calorific Value Tracking for Gas Distribution Grids with an Incomplete Measurement Infra- Structure

State of the art in the use of gas quality tracking systems for billing purposes are systems for transmission grids, where all inlets and rather all offtakes are measured. Such a complete measurement infrastructure is for most gas distribution networks very expensive and not feasible in practice. One promising approach for solving this challenge is the Nodal Point Load Observer, developed at Clausthal University of Technology, which emulates unknown offtakes, based on a mathematical model. This observation problem consists of an accurate determination of the inner state of incompletely instrumented natural gas distribution grids, based on the available measurement information. The knowledge of the inner state of the grid makes it possible to allocate a time series of a specific calorific value, and with that an amount of energy, to each offtake of the grid.